Simulation of Aerodynamically Generated Sound Using Hybrid Aeroacoustic Methods

Regular paper

Johan Hammar

KTH Royal Institute of Technology

Monday 1 june, 2015, 15:40 - 16:00

0.7 Lisbon (47)

A numerical method to simulate aerodynamically generated sound and its propagation is presented in this paper. The transient flow field solution is established using a compressible 2D Navier Stokes solver. The source terms are then defined by using Lighthill’s and Howe’s acoustic analogy, respectively, which are evaluated from the flow solutions. The propagation of acoustic waves from these sources is then performed using the wave expansion method (WEM). This is a discretization method suitable for solving wave propagation through inhomogeneous potential flows. The method is tested on a flow of a rectangular open cavity. The flow conditions are a free stream Mach number of M=0.5 and Reynolds number of Re=1500. At these conditions the flow over the cavity is characterized by a periodic role up of vorticity in the shear layer. As these vortices are then convected by the mean flow and interact with the trailing edge of the cavity, acoustic waves are created and propagate towards the leading edge, where the vorticity feedback mechanism is started again. The numerical results are compared to experimental and numerical results from other studies of the same configuration.

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